Petriello’s case is more of a conversation starter than anything, noting the similar OPS+ marks for both catchers through their age 30 seasons; both debuted at the same age (21), and Perez is currently at 101*, while Molina was at 99 at the same age. Yadier was already getting some Hall of Fame buzz by this point (2013 was his age-30 season), but Salvador hasn’t seen a similar outpouring of Hall support that Yadi had at that age. So why is that the case? Petriello mentions a few other similarities between the two as well, including their defense and intangibles.
*I’m going to be using stats only through the 2020 season and ignoring the first few days of 2021, since that’s when Petriello’s original comparison was made.
So let’s just start from the top. Using rate stats made me a little suspicious; that can be a good way to gloss over major playing time disparities, which might explain the difference. In this case… it’s not the full story, but it is part of the issue. Molina through 2013 had over 200 more games played than Perez does at this point, thanks to the shortened 2020 season and Perez missing all of 2019 for Tommy John surgery. And in comparing those lines, I noticed the other major issue with this comparison: Molina’s age-29 and -30 seasons were his two best ones, with the backstop finishing fourth and third in MVP voting those years, respectively. Baseball-Reference puts his combined value from those seasons at 13.4 Wins Above Replacement, while Fangraphs (thanks in part to their inclusion of catcher framing) has him at 15.5. That’s a lot of value that Perez just doesn’t have.
In fairness to Perez, his shortened 2020 was fantastic, and over a full season, it may have looked a little like Molina’s 2013 campaign. His offensive rate stats were better, with a 160 OPS+ to Molina’s 133 mark. But again, a 160 OPS+ over 37 is still no match for a 133 mark over 274 games (especially given that 37 games removes a lot of the wear and tear a catcher might face; there’s no guarantee he’d keep it that high over 240 more games, so we can’t just multiply it by six or something). If there’s a silver lining, it’s that it seems like Perez is still capable of having an MVP-caliber season like Molina’s, but the problem is still that Molina actually has two MVP-caliber seasons rather than just the potential for one.
Of course, there are other issues in this comparison that hurt Perez. For example, let’s look at their status as “catching gods” that Petriello mentions. I’m assuming he’s referring to defense, and that is an area where Perez is usually highlighted; he has five Gold Gloves, after all (Molina was at the same point by this age, and has gone on to win four more since then).